Method of making soda-lime



UNITED, STATES PATENT OFFICE,

CHARLES B. DUDLEY, OF ALTOONA, PENNSYILVANIA.

METHOD OF MAKING SODA-LIME.-

SPECIFICATION forming-part'of Letters Patent No. 272,127, dated February13, 1883.

Application filed October 28, 1882. (No specimens To all whom itmayconcern:

Be it known that I, CHARLES B. DUDLEY, of

Altooua,countyofBl-air, and State ofPeunsyL' Vania, have invented newand useful Improvements in Methods of Making Soda-Lime; and ldo herebydeclare that the following is a full and exact description of the same.I

This invention or discovery relates to the manufacture of soda-lime upona large scale, for use in the art of purifying waters; and it consistsin mixing sal-soda with caustic lime,

- without the application of extraneous heat,

in such proportions and in such manner that the water chemicallycombined with the sah soda'will cause the slaking ot' the lime, and thusreduce the latter, in connection with the .iformclyitoravfiue powder.

To enable othersskilled in the art to use my improved method, I willproceed to fully describe the same.

Take the ordinary sal-soda in its crystalline form,asit1s found incommerce, aiid ordinary caustic lime in its lumpy form, as it is found.

in commerce, in proper portions, as hereinafter described, and bringthem into contact with each other in any suitable-manner without the useof extraneous heath If desired, the materials in their normal conditionmay be deposited upon a su table floor and simply shoveled together.-They-may also, if de sired, be mixed and crushed by passing them .uponby the heat resulting from the slaking of the lime is reduced to apowdered condition.

The proportions of Sal-soda and caustic lime may be raried betweencerta-inlimits, according to the ratio between the carbonic acid, bothfree and as bicarbooates, and the sulphuric acid and chlorine in thewaters in which it is desired to use the powder--that is. it will benecessary inall cases to have sufficient soda in the mixture to combinewith the sulphuric acid and chlorine and sufiicient lime to combine withthe carbonic acid, both free and as bicarbonates, I

-In proportioning the ingredients, if the amount ofcrystalline water inthe soda used in any case is more than sufiicient to slake the r lime,itmay be necessary to subsequently apply heat to dry the powder. It thewater in the soda is not sutficlent to slaken the lime an additionalsupply oi water may be employed.

After the reaction has taken place the mass may be sifted for the.doublepurpose of removing the lumps of unburned lime and intermi-xing morethoroughly the two ingredients.

The ordinary caustic lime of commerce it'is well known has mixed withir,as an impurity,

more or less of magnesia; but the presence of this, while not desired,makes no material difference in the value of the product.

I am aware that soda-lime has been mannfactured from sal-soda andcaustic lime; but an essential step in the described method is theapplication of extraneou's heat to start the reaction.

Having thus fully described my discovery, what- I claim as new, anddesire to secure by Letters Patent, is-- The herein-described methodofmakingsoda lime, consisting in mixing sal-soda with caustic lime,without the application of extraneous heat, in such proportions and insuch manner that the water chemically combined with the sal-soda will betaken up by the caustic lime and produce a powdered product, as setforth.

This specification signed and witnessed this 25th day of October, 1882.

CHAS. B. DUDLEY. Witnesses:

FRANK M. GREEN, H. WvBEiDLE.

